Magnetic and microstructural properties of Fe3O4-coated Fe powder soft magnetic composites

Sunday, Katie Jo; Hanejko, Francis; Taheri, Mitra L.

doi:10.1016/j.jmmm.2016.09.024

Cited by 60 publications

(19 citation statements)

References 16 publications

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“…It was found that the use of nanoparticles of Fe 3 O 4 resulted in an improvement in soft magnetization [16]. However, Fe 3 O 4 is a semiconductor with a resistivity of 10 -2 Ω·cm, so the eddy-current core loss will increase quickly as the frequency increases [17]. MnZnFe 2 O 4 ferrite has been used in many applications such as radio frequency circus and transformer cores due to its high electrical resistivity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Xie

Yan

2018

Metals

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An iron-based soft magnetic composite with Fe 3 O 4 -MnZnFe 2 O 4 insulation coating has been prepared by powder metallurgy method. This work investigated the microstructure and magnetic properties of Fe/Fe 3 O 4 -MnZnFe 2 O 4 powder cores. Scanning electron microscopy (SEM) coupled with an energy dispersive spectrometry (EDS) analysis indicated that the Fe 3 O 4 and MnZnFe 2 O 4 nanoparticles were uniformly coated on the surface of Fe powders. The co-existence of Fe 3 O 4 and MnZnFe 2 O 4 contributes to the preferable distribution of nano-sized insulation powders and excellent soft magnetic properties of soft magnetic composite (SMC) with high saturation magnetization M s (215 A·m 2 /kg), low core loss (178.7 W/kg measured at 100 kHz, 50 mT), and high effective amplitude permeability of 114 (measured at 100 kHz). Overall, this work has great potential for realizing low core loss and outstanding soft magnetic properties of Fe-based powder cores.

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Section: Introductionmentioning

confidence: 99%

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Xie

Yan

2018

Metals

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“…For practical applications of soft magnetic materials, P s under a dynamic magnetic field is a very important parameter in evaluating the application of magnetic materials. In general, P s can be decomposed into the sum of three loss generations, P h , P e and residual loss (P r ) [38]. Under our test conditions, the effect of P r can be ignored due to the frequency being not very high [38].…”

Section: Discussionmentioning

confidence: 99%

“…In general, P s can be decomposed into the sum of three loss generations, P h , P e and residual loss (P r ) [38]. Under our test conditions, the effect of P r can be ignored due to the frequency being not very high [38]. P s can be expressed as Equation (1) [39]:…”

Section: Discussionmentioning

confidence: 99%

The AC Soft Magnetic Properties of FeCoNixCuAl (1.0 ≤ x ≤ 1.75) High-Entropy Alloys

Wang

Zhang

et al. 2019

Materials

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High-entropy alloys (HEAs) with soft magnetic properties are one of the new candidate soft magnetic materials which are usually used under an alternating current (AC) magnetic field. In this work, the AC soft magnetic properties are investigated for FeCoNixCuAl (1.0 ≤ x ≤ 1.75) HEAs. The X-ray diffraction (XRD) and scanning electron microscope (SEM) show that the alloy consists of two phases, namely a face-centred cubic (FCC) phase and a body-centred cubic (BCC) phase. With increasing Ni content, the FCC phase content increased. Further research shows that the AC soft magnetic properties of these alloys are closely related to their phase constitution. Increasing the FCC phase content contributes to a decrease in the values of AC remanence (AC Br), AC coercivity (AC Hc) and AC total loss (Ps), while it is harmful to the AC maximum magnetic flux density (AC Bm). Ps can be divided into two parts: AC hysteresis loss (Ph) and eddy current loss (Pe). With increasing frequency f, the ratio of Ph/Ps decreases for all samples. When f ≤ 150 Hz, Ph/Ps > 70%, which means that Ph mainly contributes to Ps. When f ≥ 800 Hz, Ph/Ps < 40% (except for the x = 1.0 sample), which means that Pe mainly contributes to Ps. At the same frequency, the ratio of Ph/Ps decreases gradually with increasing FCC phase content. The values of Pe and Ph are mainly related to the electrical resistivity (ρ) and the AC Hc, respectively. This provides a direction to reduce Ps.

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“…Therefore, some works on increment density by adjusting powder particles size distribution. It is demonstrated that the dimensions, purity, and size distribution of the magnetic particulate has tremendous influences on the microstructure and electromagnetic performance of the powder cores [18,19]. Some authors investigated the influence of the particle size of the powder on the core's magnetic properties [20,21].…”

Section: Introductionmentioning

confidence: 99%

Fe-6.5 wt%Si Powder Cores with Low Core Loss by Optimizing Particle Size Distribution

Huang

Jiao²,

Yu³

et al. 2020

Metals

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The effect of different particle size distribution of Fe-6.5 wt%Si powder on the microstructure and soft magnetic properties of the corresponding soft magnetic powder cores (SMPCs) was investigated. By optimizing particle size distribution, the density of SMPCs increased and the total core loss significantly decreased. According to the result of loss separation, density of SMPCs is inversely proportional to hysteresis loss, while with increasing the content of the fine particles, the eddy current loss significantly decreased. It was found that with magnetic powder of particle size-grading as 10%, 10%, 60%, and 20% for particles with size between −75 to +38, −38 to +23, −23 to +13, and −13 μm, respectively, the Fe-6.5 wt%Si SMPCs exhibit optimal comprehensive magnetic performances with the effective permeability of about 60, the percent permeability at 100 Oe is up to 70%, and the lowest core loss of 553 mW/cm3.

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Magnetic and microstructural properties of Fe3O4-coated Fe powder soft magnetic composites

Cited by 60 publications

References 16 publications

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

The AC Soft Magnetic Properties of FeCoNixCuAl (1.0 ≤ x ≤ 1.75) High-Entropy Alloys

Fe-6.5 wt%Si Powder Cores with Low Core Loss by Optimizing Particle Size Distribution

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